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2017 Sorento ABS/ESC lights on - soft brake pedal

0

Mike T. · rep 0 · May 25, 2:08 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Sorento SX Limited

My 2017 Kia Sorento SX Limited just threw on both the ABS and ESC warning lights on the dashboard. It happened suddenly while driving. I also noticed the brake pedal feels a bit softer than usual, almost spongy, though I can still stop the car.

I'm really worried about driving it like this, especially with the safety systems potentially compromised. I haven't noticed any visible fluid leaks under the car. Has anyone experienced this with their Sorento? What could be the common culprits here, and is it safe to drive to a mechanic?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:08 AM

0

ClearTheCode admin answer:

When your ABS and ESC lights illuminate and you experience a soft brake pedal, it's a clear indication of a potential issue within your vehicle's braking or stability control system. This situation warrants immediate attention due to safety concerns.

Here are the common causes and steps to consider:

  1. Check Brake Fluid Level: A low brake fluid level can cause a soft pedal and trigger warning lights. Inspect the reservoir under the hood. If it's low, top it off with the correct DOT fluid specified in your owner's manual. A sudden drop in fluid usually indicates a leak.
  2. Wheel Speed Sensors: These sensors monitor the speed of each wheel for the ABS and ESC systems. A faulty or dirty sensor, or damaged wiring, can send incorrect signals, leading to system malfunctions and dashboard lights. Diagnostic trouble codes (DTCs) like C1200, C1203, or C1210 often point to specific wheel speed sensor issues.
  3. ABS Control Module Failure: The ABS control module is the 'brain' of the anti-lock braking system. If it malfunctions, it can disable both ABS and ESC. This is a more costly repair but can sometimes be diagnosed with specific OBD-II scanners.
  4. Brake System Leaks: Even if you don't see a puddle, an internal leak (e.g., master cylinder bypass) or a small external leak can cause a soft pedal. Check brake lines, calipers, and wheel cylinders for any signs of fluid.
  5. Vacuum Booster Issues: A failing brake booster can affect pedal feel, making it hard or soft, and might indirectly impact braking efficiency, though it's less likely to directly trigger ABS/ESC lights without other accompanying issues.

When to See a Shop: It is not recommended to drive long distances with both ABS and ESC lights on and a soft brake pedal. Your vehicle's ability to stop safely and maintain control in emergency braking situations is compromised. You should:

  • Have the vehicle towed to a trusted mechanic or Kia dealership as soon as possible.
  • Request a full diagnostic scan to retrieve any stored OBD-II codes. These codes are crucial for accurately pinpointing the problem.
  • Have the entire braking system inspected, including fluid lines, master cylinder, calipers, and wheel speed sensors.
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